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ACS LHE Series Operation And Instruction Manual

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LHE Series Central Chillers
OPERATION AND INSTRUCTION MANUAL
MODELS COVERED:
LHE20W, LHE25W, LHE30W, LHE40W, LHE50W, LHE60W,
LHE20R, LHE25R, LHE30R, LHE40R, LHE50R, LHE60R
Part Number: 882.04385.EN
Revision: 04/2025

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  • Page 1 LHE Series Central Chillers OPERATION AND INSTRUCTION MANUAL MODELS COVERED: LHE20W, LHE25W, LHE30W, LHE40W, LHE50W, LHE60W, LHE20R, LHE25R, LHE30R, LHE40R, LHE50R, LHE60R Part Number: 882.04385.EN Revision: 04/2025...
  • Page 2 _________________________ We are committed to a continuing program of product improvement. Specifications, appearance, and dimensions described in this manual are subject to change without notice. ECN No. ____________ © Copyright 2025 All rights reserved. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 3: Unpacking And Inspection

    A certified copy of our invoice is available upon request. The original Bill of Lading is attached to our original invoice. If the shipment was prepaid, contact ACS for a receipted transportation bill. Advise customer service regarding your wish for assistance and to obtain an SRO (Service Request Order).

  • Page 4: Returns

    ACS Group for approval and be approved by ACS Group in writing prior to commission. The product warranty is voided when any unapproved change is made to an ACS Group product.

  • Page 5: Table Of Contents

    Safety Devices and Interlocks ....................17 Crankcase Heater ......................17 High Pressure Cutout ......................17 Pressure Transducers ....................... 18 Flow Switch ........................18 Remote Start/Stop Interlock ....................18 Remote Setpoint ....................... 18 Optional Features ........................19 LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 6 Three-Phase Compressors ....................25 3-11 Process Fluid Temperature Considerations ................25 3-12 Adding Glycol to the Process Fluid ..................26 The following glycol products are available from ACS: ............. 26 3-13 Initial Set Up ..........................27 3-14 Ship Loose Items ........................28 CHAPTER 4: REMOTE AIR COOLED CONDENSER –...
  • Page 7 Updating an Exor HMI Program using a USB Stick ..............75 Downloading Alarm History to a USB Stick ................76 Downloading Chiller Logs to a USB Stick ................77 Changing the Exor IP Address ....................78 LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 8 Troubleshooting Warnings and Faults from the PLC ............... 88 CHAPTER 9: APPENDIX....................93 Piping Schematic for Water Cooled Chiller ................93 Piping Schematic for Remote Cooled Chiller ................94 Table of Figures ........................95 Technical Assistance ......................105 LHE Series Central Chillers 882.04385.EN viii 04/2025...

  • Page 9: Chapter 1: Safety

    A spare parts list with part numbers specific to your machine is provided with your shipping paperwork package. Refer to this section for a listing of spare parts for purchase. Have your serial number and model number ready when ordering. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 10: Safety Symbols Used In This Manual

    Each individual must take responsibility for observing the prescribed safety rules as outlined. All caution, warning and danger signs must be observed and obeyed. Any actual or potentially dangerous conditions must be reported to your immediate supervisor. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 11: Safety Tags And Warning Labels

    Lock out. This equipment is operated with 3-phase electrical power. Therefore, when performing any maintenance operations, we recommend following the local standards for performing a lock-out/tag-out procedure. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 12: Warnings And Precautions

    SAFETY GLASSES OR A FACE SHIELD MUST ALWAYS BE WORN when servicing or operating the machine. EAR PROTECTION: The Occupational Safety and Health Act of 1970 has established guidelines for Permissible Noise Exposures (OSHA 1910.95) that should be followed. LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 13 We have long recognized the importance of safety and have designed and manufactured our equipment with operator safety as a prime consideration. We expect you, as a user, to abide by the foregoing recommendations in order to make operator safety a reality. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 14: Chapter 2: Functional Description

    Standard chiller range of operation is 20ºF to 80ºF (-7ºC to 27ºC). It is required to use a water/glycol mix when the operating range is below 50ºF (10ºC). See section 3-11 for details. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 15: Standard Features

    Standard voltage: 460/3/60 UL/cUL Labeled Electrical Subpanel: This option provides for the subpanel to be listed with Underwriters Laboratory, with UL-related benefits and features. Sub-panels marked by the UL/cUL sticker are accepted within Canada. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 16: Refrigeration Features

    Panel Mount dual circuit alarm horn/light, 65mm diameter red lens, 103dB @ 1M MASTER UNIT ONLY Warranty One year labor warranty (US and Canada only) One year parts warranty Three year limited controller warranty LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 17: Safety Devices And Interlocks

    High-pressure cutout is a manual reset device typically mounted on the compressor discharge line behind the electrical enclosure. Call a refrigeration service technician to analyze the problem and reset the control. Figure 2 - Typical LHE_20T-60T High Pressure Sensor and Reset Location High pressure cutout LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 18: Pressure Transducers

    PLC’s configurable analog input. Any setpoint entered via the HMI display on the master will be ignored while the system is set to remote control. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 19: Optional Features

    When such a condition is detected, the relay sends a feedback signal to the Carel controller, which in turn shuts off all outputs and activates an alarm to prevent potential equipment damage. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 20: Chapter 3: Installation

    Refer to your local electrical requirements for proper feeder conductor and supply disconnecting sizing. For instance, in the United States, refer to National Electric Code (NEC) Article 430-24 through 430-26, Table 310.15(B)(2)(a) LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 21: Chiller Foundation

    The indoor modules have been designed to be moved with a forklift. Use caution when moving the modules to ensure proper weight distribution. Use care when LOADING, UNLOADING, RIGGING, or MOVING this equipment. Figure 4 - Typical Front and Bottom Views Forklift Pockets LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 22: Process Water Connections

    ACS Group does not warrant the freeze up of the evaporator under any circumstances. Be sure to reduce external pressure drop as much as possible by generously sizing all piping.

  • Page 23: Galvanic Corrosion Considerations

    The use of poor quality water may result in inefficient operation, heat exchanger damage, and pump seal damage. Consult a qualified water treatment specialist to determine what type of treatment is needed. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 24: Refrigeration Circuit And Water Condenser Piping

    Each water cooled condenser is equipped with a two way electronic water regulating valve to control the amount of water allowed to pass through the condenser, in order to maintain proper refrigeration pressures in the circuit. Condenser Water Out Condenser Water In LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 25: Checking Motor Direction

    Operating the chiller setpoint below 50°F (10°C) without the proper amount of glycol for freeze protection could result in a damaged evaporator. ACS Group does not warranty the freeze up of the evaporator under any circumstances. DO NOT use automotive grade glycol additives, as the lubricants in it can cause pump seal failures that would not be covered by warranty.

  • Page 26: Adding Glycol To The Process Fluid

    3-12 Adding Glycol to the Process Fluid The following glycol products are available from ACS: Part Number Description 216.00014.00 Ethylene glycol, 5 gallons (18.9 liters) 216.00014.01 Ethylene glycol, 55 gallons (208.2 liters) 216.00013.00 Propylene glycol, 5 gallons (18.9 liters) 216.00013.01 Propylene glycol, 55 gallons (208.2 liters)

  • Page 27: Initial Set Up

    Operating the chiller tank temperature setpoint below 50°F (10°C) without the proper amount of glycol for freeze protection could result in a damaged evaporator. ACS Group does not warrant the freeze up of the evaporator under any circumstances.

  • Page 28: Ship Loose Items

    3-14 Ship Loose Items 701.00200.01 LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 29 LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 30: Chapter 4: Remote Air Cooled Condenser - Installation

    It is also good practice to consider locating the condenser where the fan noise and vibration transmissions do not affect work areas. Avoiding locations near exhaust fans, plumbing vents, flues, or chimneys is also recommended. LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 31 LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 32: Lifting Remote Condensers

    Figure 7 - Rigging Instructions for Standard Air-Cooled Condenser REMOVE FEET THAT ARE ATTACHED TO TOP OF LIFTING BRACKETS AND INSTALL ON BOTTOM OF LEGS AFTER UNIT HAS BEEN ROTATED TO UPRIGHT POSITION. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 33: Remote Air-Cooled Chiller Condensers

    MUST be relieved prior to cutting or brazing copper tubing. INJURY WILL RESULT IF PRESSURE IS NOT RELIEVED. Figure 8 - Condenser Connections and Location of Filter Dryer CONDENSER DISCHARGE INLET CONDENSER FROM CONDENSER DISCHARGE OUTLET TO CONDENSER FILTER DRYER WITH REPLACEABLE CORES LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 34: Interconnecting Refrigerant Piping

    15% silver solder. Install an ACS Group supplied 650 psi approved R410A or R454B refrigerant relief valve in the discharge line at the condenser following all applicable codes.

  • Page 35: System Configuration

    • Refrigeration lines must not be crossed, i.e., chiller liquid line is to be piped to condenser liquid line. Figure 9 Remote Air-Cooled Chiller Configurations A separate Double Riser is needed for every 25ft of up flow discharge piping. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 36: Installation Of Pressure Relief Device For A Remote Condenser Chiller

    (Refer to Figure 10) Figure 11 Remote Condenser Configurations ACS Group has supplied with this chiller one (1) refrigerant relief valve and one (1) 3/8 x 3/8 FPT forged bronze fitting.

  • Page 37: Sizing Refrigerant Lines

    1/2” for every 10 feet. This will allow oil to flow towards the condenser. Pressure Drop Equivalent Pipe Length (Feet) Line Size Angle 90⁰ 90⁰ Long 90⁰ 45⁰ 45⁰ OD (inches) Valve Standard Radius EL Street Standard Street 1 1/8 1 3/8 1 5/8 2 1/8 LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 38: Liquid Line Sizing

    1 3/8 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8 1 3/8 1 3/8 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8 1 3/8 1 3/8 LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 39: Discharge Line Sizing

    B-1-3/8 B-1-3/8 B-1-3/8 B-1-3/8 B-1-3/8 B-1-3/8 B-1-3/8 B-1-3/8 B-1-3/8 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 A-3/4 LHE60 B-1-5/8 B-1-5/8 B-1-5/8 B-1-5/8 B-1-5/8 B-1-5/8 B-1-5/8 B-1-5/8 B-1-5/8 B-1-5/8 B-1-5/8 B-1-5/8 LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 40: Refrigerant Charge Determination

    Additional oil required is dependent on the amount of additional refrigerant added. Calculate the amount of additional oil required by using the following formula: lbs.of refrigerant added for field piping Pints of oil = LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 41: Finishing Setup: Password Protection

    0 equating to no password necessary to access the corresponding access level. Duration for each passworded mode to be active can be defined from 2 to 99 minutes, after which access will time out. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 42: Chapter 5: General Operation Overview

    Operating the chiller setpoint below 50°F (10°C) without the proper amount of glycol for freeze protection could result in a damaged evaporator. ACS Group does not warrant the freeze up of the evaporator under any circumstances. Figure 12 - Touch screen controller buttons and descriptions...

  • Page 43: Initial Start-Up /Setting Tank Temperature Setpoint

    Operate the chiller system, looking for any leaks and listening for unusual noises or vibrations that could indicate improper operation. Elevated sound level and substantially reduced current draw indicate reversed pump rotation. After several minutes of operation, the compressor’s internal protection circuit will trip. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 44: Alarms And Settings

    If no active alarms exist at the time is pressed, an alarm history will be displayed instead. See Section 7-7 for more details on A2L leak sensor triggers and warnings. LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 45 While in the Alarm History or Active Alarms screens, touching will bring up the alarm help menu. Tapping on the desired menu item will bring up a help dialog box that describes the alarm component in further detail. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 46: Alarm Settings

    High Refr Level High refrigerant level fault setpoint Determines how far below the high refrigerant fault High Refr Level Hys setpoint the refrigerant level must drop before the alarm can be cleared LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 47: Chiller Settings

    Chiller Settings screens. You can cycle between settings pages by touching the left and right arrow buttons at the top of the page. Chiller Settings 1 Chiller Settings 2 Chiller Settings 3 LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 48 C Loss Off Dly stages/compressors when communication with the master circuit has been lost, and the circuit is controlling its compressors directly † Verify proper glycol mixture in process fluid before changing this setting. LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 49 Condenser fan start setpoint when low ambient discharge mode is active Cond Fan Stop Condenser fan stop setpoint when low ambient discharge mode is active Fan Setpoint Condenser fan setpoint when low ambient discharge mode is active LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 50: Enables

    Touching the desired circuit number will enable or disable that circuit. Touching the illustration of compressor A or B in each circuit will enable or disable that compressor. Tapping while in the “Enables” screen will bring up the context help dialog box. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 51: Loop Setpoints

    You can return to the home screen at any time by touching Loop Setpoints 1 screen Loop Setpoints 2 screen Loop Setpoints 3 screen LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 52: Access Levels Needed To Manipulate A Given Loop Setpoints Value And Its Description

    P parameter of the EEV high temp PID loop EEV PID High I I parameter of the EEV high temp PID loop EEV PID High D D parameter of the EEV high temp PID loop LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 53 P parameter of the HG DP high temp PID loop HG DP PID High I I parameter of the HG DP high temp PID loop HG DP PID High D D parameter of the HG DP high temp PID loop LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 54 P parameter of the HG Tmp high temp PID loop HG Tmp PID High I I parameter of the HG Tmp high temp PID loop HG Tmp PID High D D parameter of the HG Tmp high temp PID loop LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 55: Network Settings

    “Network Settings” screen found by navigating through the Main Menu. Tap on the appropriate field and type in the desired value. For more detailed information on variable definitions for use in communications protocol, see Appendix 9-3. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 56: Passwords

    Time in minutes for operator password to be active Supervisor Password 4-digit password for supervisory interaction Supervisor PW Duration Time in minutes for supervisor password to be active Service PW Duration Service password duration LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 57: Save Restore

    , your selection will be highlighted. If using an external storage device, be sure it is installed in the controller properly, as outlined in Section 6-3. Once all the options are chosen, tap to complete the task. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 58: Sensor Setup

    Suction pressure sensor offset Reduced Flow Min Reduced flow sensor minimum Reduced Flow Max Reduced flow sensor maximum † Reduced flow sensor offset Reduced Flow Offset † Indicates a setting shown on subsequent pages for other ci LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 59: Service Info

    5-11 Service Info Tapping the “Service Info” button shows contact information for ACS group to access technical answers, knowledge, and aftermarket sales. Service Info Screen 5-12 System Info Tapping the “System Info” button shows various data points defining the operation of your chiller circuits.

  • Page 60: System Setup

    Number of pump tanks in the system Circuit Refrigerant Shows the refrigerant used in each circuit Circuit Temp Sensors Temperature sensor type for each circuit Circuit Serial Numbers Serial numbers of the chillers in the system LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 61: System Status

    Tank temperature retransmission offset 5-14 System Status Tapping “System Status” will bring up a screen showing various values related to the status of various sensors and devices in the chiller system. System Status screen LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 62: Time And Date

    Tapping the left and right arrows at the top of the screen cycles between active circuits in your system for the given trend graph. Live pressures graph for a given circuit Log of pressures over an indicated duration for a given circuit LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 63 Live temperatures graph for a given circuit Log of temperatures over an indicated duration for a given circuit Live valve outputs graph for a given circuit Log of valve outputs over an indicated duration for a given circuit LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 64: Chiller Operation

    0.0%. The second stage deactivates either when the chiller fluid out temperature is less than, or equal to, the circuit’s setpoint minus 2°F, or the hot gas temp. loop reaches 100%. LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 65 ‘stage on’ a compressor. When the number of requested stages is greater than the number of active stages, a stage is activated. Once a stage’s compressor enables, the ‘stage on delay’ timer is activated. If required, once the delay timer expires, the next stage will be allowed to activate. LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 66 When local staging control is enabled (communication loss) a ‘chiller out temperature’ based hot gas PID loop is activated in addition to the configured loops. The loop with the highest output percentage is used. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 67: Discharge Pressure Control

    The minimum and maximum pressures for the output are set by the discharge pressure minimum and discharge pressure maximum setpoints. On Remote air cooled chillers, the PID loop output is limited to 50% when the ambient temperature is less than or equal to -10°C. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 68: Electronic Expansion Valve (Eev)

    If a drone circuit loses communication with the master, an alarm will present, and it will use its local chiller out temperature as a temporary setpoint until the issue is resolved as described under Communication Loss Control. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 69: Hour Meters

    USB stick. Optionally, hour meters can be included in the save or restore. The variables can be saved in one of 99 individual slots. Exported files are named: “export_#” where “#” is the selected slot number. Save/Restore is not available when the chiller is online. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 70: Inputs & Outputs

    • System Online - The output activates when the system is online • Cabinet Refrigerant Detected - Activates available dry contact to connect to external ventilation system in case of A2L refrigerant leak) * Available option LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 71: Network Addressing

    Network communications use an RJ-45 hardware interface using the basic Ethernet TCP/IP layer stack. Protocols available are Ethernet IP, BACNet IP and ModBus IP. For more detailed information on variable definitions for use in communications protocol, see Appendix 9-3. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 72: Chapter 6: Interfacing With The Controller Hardware

    Chapter 6: Interfacing with the controller hardware Changing the Circuit Number on the C.pCO PLC LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 73: Updating A C.pco's Program Using A Usb Stick

    Updating a C.pCO’s Program Using a USB Stick LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 74: Saving Or Restoring Settings To A Usb Stick

    Saving or Restoring Settings to a USB Stick LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 75: Updating An Exor Hmi Program Using A Usb Stick

    Updating an Exor HMI Program using a USB Stick LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 76: Downloading Alarm History To A Usb Stick

    Downloading Alarm History to a USB Stick LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 77: Downloading Chiller Logs To A Usb Stick

    Downloading Chiller Logs to a USB Stick LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 78: Changing The Exor Ip Address

    Changing the Exor IP Address 192.168.5.6 LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 79: Chapter 7: Maintenance

    216.00015.00) through the water side of the condenser following all directions on the container. Do not use steam or water over 140ºF (60ºC) to clean a condenser unless you are monitoring the refrigeration module for excessive pressure with gauges. Only a trained technician should use this method. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 80: Maintaining The Evaporator

    2. Open the upper and lower evaporator ball valves to drain the process fluid from the evaporator. 3. Connect an isolated pumping system, similar to ACS Part number: 602.83607.00, to the upper and lower evaporator ball valves with the inlet to the lower valve and the outlet to the upper valve 4.

  • Page 81: Evaporator Process Strainer

    The warranty does not cover chiller failures from a dirty evaporator. Should your filter screen become damaged, contact ACS Customer Service Group to purchase the proper screen for your size of chiller as defined below:...

  • Page 82: Preventative Maintenance Service

    • Checking compressor oil level on units with tandem compressors • Checking lubrication of motor and pump bearings • Checking circulating pump operation • Checking flow through heat exchangers • Checking compressor efficiency • Checking noise levels LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 83: A2L Refrigerant Handling And Safety

    Upon receipt of the chiller unit, it is advised to calculate and enter the room size and maximum charge allowed on this card for future information, as well as the serial number of the unit associated with the card, if that is not already filled out. LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 84 Below is a chart of calculated values to base general sizing on, where M is the refrigerant charge, and A the smallest room footprint recommended for that charge size.: Figure 14 - UL Refrigerant Charge Table and Room Size Calculations LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 85: Service Ports

    Refer to supplied schematics, or reach out to the sales and service teams for more information on how to utilize this contact. A2L leak sensor LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 86: Chapter 8: Troubleshooting Alarms

    Contact compressor(s) Hot gas is not coming on Service if output value remains at cycle(s) at short 0% throughout compressor cycle. intervals. Install bypass between to-and-from Low water flow process line LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 87 Unit low on refrigerant. viewing sight glass on liquid line enough cooling power. upstream of the expansion valve. Compressor not operating efficiently. Call service. Unit under-sized for application. Call sales rep LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 88: Troubleshooting Warnings And Faults From The Plc

    Condenser inlet temperature Contact ACS Group Aftermarket Low Discharge Pressure too low Service for assistance Fault (Discharge pressure has fallen Condenser water regulating Verify analog output on PLC below fault setpoint) valve open LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 89 18 in (46 cm) above the pump (optional: will only Fluid level too low in tank suction centerline while the pump is become active if level operating sensor is enabled in Supervisor Menu) Sensor failure See Level Sensor Fault LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 90 Service for assistance Compressor Differential Pressure Fault Condenser water regulating Verify analog output on PLC valve open High Suction Pressure Load may be too high for Contact your sales representative for Warning chiller assistance. LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 91 Low fluid flow through evaporator Verify evaporator pump operation Clean evaporator inlet strainer Leaving fluid temperature Verify Fluid Freeze point setpoint and close to Fluid Freeze point glycol/water mixture for proper Setpoint freezing temperature LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 92 Input to PLC is missing Verify wiring at PLC Tank Level Sensor Failure Faulty sensor cable Replace cable Faulty sensor Replace sensor Low Suction Pressure at Contact ACS Group Aftermarket Startup Service for assistance LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 93: Chapter 9: Appendix

    Chapter 9: Appendix Piping Schematic for Water Cooled Chiller The schematic for an LHE60W is shown below, for reference only. Piping sizes and other details may differ on the chiller you have received. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 94: Piping Schematic For Remote Cooled Chiller

    Piping Schematic for Remote Cooled Chiller The schematic for an LHE60R is shown below, for reference only. Piping sizes and other details may differ from the chiller you have received. LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 95: Table Of Figures

    300422 300026 Circuit 2 Refrigerant Liquid Temp 16bit Integer Read Only Analog Input C2_Refr_Liq_Temp Input Register 300440 300027 Circuit 2 Refrigerant Suction 16bit Integer Read Only Analog Input C2_Refr_Suct_Temp Input Register 300458 300028 Temperature LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 96 % Circuit 4 Fluid Flow 16bit Integer Read Only Analog Input C4_Fld_Flow Input Register 300689 300057 Circuit 4 Hot Gas Bypass Percent 16bit Integer Read Only Analog Input C4_Hot_Gas_Output Input Register 300424 300058 LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 97 Temperature Circuit 6 Discharge Pressure 16bit Integer Read Only Analog Input C6_Dsch_Pressure Input Register 300435 300086 Circuit 6 Electronic Expansion Valve 16bit Integer Read Only Analog Input C6_EEV_Output Input Register 300408 300087 Output Percent LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 98 300356 300115 Circuit 8 Chil Out Temperature 16bit Integer Read Only Analog Input C8_Chil_Out_Temp Input Register 300365 300116 Circuit 8 Condenser Inlet 16bit Integer Read Only Analog Input C8_Cond_In_Temp Input Register 300606 300117 Temperature LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 99 Input Register 300384 300145 Circuit 10 Approach Temperature 16bit Integer Read Only Analog Input C10_Approach_Temp Input Register 300686 300146 Circuit 10 Chil In Temperature 16bit Integer Read Only Analog Input C10_Chil_In_Temp Input Register 300358 300147 LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 100 16bit Unsigned Circuit 3 Alarm Bits 3 Read Only Integer Value C3_Alarm_Status_3 Input Register 300697 300171 Integer 16bit Unsigned Circuit 4 Alarm Bits 1 Read Only Integer Value C4_Alarm_Status_1 Input Register 300262 300172 Integer LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 101 Circuit 1 Status Bits 1 16bit Unsigned Read Only Integer Value C1_Status_Bits_1 Input Register 300000 300193 Integer Circuit 1 Status Bits 2 16bit Unsigned Read Only Integer Value C1_Status_Bits_2 Input Register 300001 300194 Integer LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 102 Circuit 8 Status Bits 2 16bit Unsigned Read Only Integer Value C8_Status_Bits_2 Input Register 300624 300215 Integer Circuit 8 Status Bits 3 16bit Unsigned Read Only Integer Value C8_Status_Bits_3 Input Register 300633 300216 Integer LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 103 Alarm Active (At Least One Alarm Boolean Read Only Binary Input Alarm_Active Discrete Input 100322 100002 Active on Chiller) Remote Mode (0=Local, 1=Mode) --- Boolean Read Only Binary Input Remote_Mode Discrete Input 100009 100003 Monitor remote digital input LHE Series Central Chillers 882.04385.EN 04/2025...
  • Page 104 Figure 11 Relief Valve Orientation ................36 Figure 12 - Touch screen controller buttons and descriptions ........42 Figure 13 - A2L Refrigerant Service Charge Log ............83 Figure 14 - UL Refrigerant Charge Table and Room Size Calculations......84 LHE Series Central Chillers 882.04385.EN 04/2025...

  • Page 105: Parts Support

    Technical Assistance PARTS SUPPORT ACS welcomes inquiries on all your parts needs and is dedicated to providing excellent customer service. The ACS Customer Service Group will provide your company with genuine OEM quality parts manufactured to engineering design specifications, which will maximize your equipment’s performance and efficiency.

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